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Noun
belemnite
Definition: a conical calcareous fossil tapering to a point at one end and with a conical cavity at the other end containing (when unbroken) a small chambered phragmocone from the shell of any of numerous extinct cephalopods of the family Belemnitidae
Definition: Any member of the extinct order †Belemnitida of Mesozoic marine cephalopods, very similar in many ways to the modern squid and closely related to the modern cuttlefish.